Prayer: The Eldest Son's Recitation Rules for His Mother's Qadaʾ Prayers
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 1375
If the eldest son wishes to perform the qaḍāʾ prayers of his mother, he must act according to his own duty with regard to reciting Sūrat al-Ḥamd and the other surah aloud or in a whisper. Therefore, he must perform his mother’s qaḍāʾ ṣubḥ, maghrib, and ʿishāʾ prayers [by reciting Sūrat al-Ḥamd and the other surah] aloud.